function system(mainWindow, dir, lang, dirname) {
	const electron = require("electron");
	const app = electron.app;
	const join = require("path").join;
	var Jimp = require("jimp");
	const fs = require("fs");
	var JSON5 = require("json5");
	var ipc = electron.ipcMain;
	const clipboard = electron.clipboard;
	var tmp_img = join(app.getPath("userData"), "tmp.png");
	var ha_path = join(app.getPath("userData"), "hardwareAcceleration");
	var ua_path = join(app.getPath("userData"), "useragent");
	var lang_path = join(app.getPath("userData"), "language");
	var log_dir_path = join(app.getPath("userData"), "logs");
	//ログ
	var today = new Date();
	//今日のやつ
	var todayStr = today.getFullYear() + "" + (today.getMonth() + 1) + "" + today.getDate() + ".log";
	//昨日のやつ
	today.setDate(today.getDate() - 1);
	var yestStr = today.getFullYear() + "" + (today.getMonth() + 1) + "" + today.getDate() + ".log";
	//一昨日のやつ
	today.setDate(today.getDate() - 1);
	var yest2Str = today.getFullYear() + "" + (today.getMonth() + 1) + "" + today.getDate() + ".log";

	const BrowserWindow = electron.BrowserWindow;
	const dialog = electron.dialog;
	const os = require("os");
	const language = require("../main/language.js");
	//プラットフォーム
	ipc.on("getPlatform", function(e, arg) {
		try {
			var gitHash = fs.readFileSync("git", "utf8");
		} catch {
			var gitHash = null;
		}
		e.sender.webContents.send("platform", [process.platform, process.arch, process.version, process.versions.chrome, process.versions.electron, gitHash]);
	});
	//言語
	ipc.on("lang", function(e, arg) {
		console.log("set:" + arg);
		fs.writeFileSync(lang_path, arg);
		e.sender.webContents.send("langres", arg);
	});
	//エクスポートのダイアログ
	ipc.on("exportSettings", function(e, args) {
		dialog.showSaveDialog(
			null,
			{
				title: "Export",
				properties: ["openFile", "createDirectory"],
				defaultPath: "export.thedeskconfig.json5"
			},
			savedFiles => {
				if (!savedFiles) {
					return false;
				}
				e.sender.webContents.send("exportSettingsFile", savedFiles);
			}
		);
	});
	//インポートのダイアログ
	ipc.on("importSettings", function(e, args) {
		dialog.showOpenDialog(
			null,
			{
				title: "Import",
				properties: ["openFile"],
				filters: [{ name: "TheDesk Config", extensions: ["thedeskconfig", "thedeskconfigv2", "json5"] }]
			},
			fileNames => {
				if (!fileNames) {
					return false;
				}
				e.sender.webContents.send("config", JSON5.parse(fs.readFileSync(fileNames[0], "utf8")));
			}
		);
	});
	//保存フォルダのダイアログ
	ipc.on("savefolder", function(e, args) {
		dialog.showOpenDialog(
			null,
			{
				title: "Save folder",
				properties: ["openDirectory"]
			},
			fileNames => {
				e.sender.webContents.send("savefolder", fileNames[0]);
			}
		);
	});
	//カスタムサウンドのダイアログ
	ipc.on("customSound", function(e, arg) {
		dialog.showOpenDialog(
			null,
			{
				title: "Custom sound",
				properties: ["openFile"],
				filters: [{ name: "Audio", extensions: ["mp3", "aac", "wav", "flac", "m4a"] }, { name: "All", extensions: ["*"] }]
			},
			fileNames => {
				e.sender.webContents.send("customSoundRender", [arg, fileNames[0]]);
			}
		);
	});

	//ハードウェアアクセラレーションの無効化
	ipc.on("ha", function(e, arg) {
		if (arg == "true") {
			fs.writeFileSync(ha_path, arg);
		} else {
			fs.unlink(ha_path, function(err) {});
		}
		app.relaunch();
		app.exit();
	});
	ipc.on("ua", function(e, arg) {
		if (arg == "") {
			fs.unlink(ua_path, function(err) {});
		} else {
			fs.writeFileSync(ua_path, arg);
		}
		app.relaunch();
		app.exit();
	});

	ipc.on("quit", (e, args) => {
		app.quit();
	});
	ipc.on("about", (e, args) => {
		about();
	});
	function about() {
		var ver = app.getVersion();
		var window = new BrowserWindow({
			webPreferences: {
				webviewTag: false,
				nodeIntegration: false,
				contextIsolation: true,
				preload: join(dirname, "js", "platform", "preload.js")
			},
			width: 300,
			height: 500,
			transparent: false, // ウィンドウの背景を透過
			frame: false, // 枠の無いウィンドウ
			resizable: false
		});
		window.loadURL(dir + "/about.html?ver=" + ver);
		return "true";
	}
	ipc.on("nano", function(e, x, y) {
		var nano_info_path = join(app.getPath("userData"), "nano-window-position.json");
		var window_pos;
		try {
			window_pos = JSON.parse(fs.readFileSync(nano_info_path, "utf8"));
		} catch (e) {
			window_pos = [0, 0]; // デフォルトバリュー
		}
		var nanowindow = new BrowserWindow({
			webPreferences: {
				webviewTag: false,
				nodeIntegration: false,
				contextIsolation: true,
				preload: join(dirname, "js", "platform", "preload.js")
			},
			width: 350,
			height: 140,
			transparent: false, // ウィンドウの背景を透過
			frame: false, // 枠の無いウィンドウ
			resizable: false
		});
		nanowindow.loadURL(dir + "/nano.html");
		nanowindow.setAlwaysOnTop(true);
		//nanowindow.toggleDevTools()
		nanowindow.setPosition(window_pos[0], window_pos[1]);
		nanowindow.on("close", function() {
			fs.writeFileSync(nano_info_path, JSON.stringify(nanowindow.getPosition()));
		});
		return true;
	});
	var cbTimer1;
	ipc.on("startmem", (e, arg) => {
		event = e.sender;
		cbTimer1 = setInterval(mems, 1000);
	});
	function mems() {
		var mem = os.totalmem() - os.freemem();
		if (mainWindow) {
			event.webContents.send("memory", [mem, os.cpus()[0].model, os.totalmem()]);
		}
	}
	ipc.on("endmem", (e, arg) => {
		if (cbTimer1) {
			clearInterval(cbTimer1);
		}
	});

	ipc.on("export", (e, args) => {
		fs.writeFileSync(args[0], JSON5.stringify(args[1]));
		e.sender.webContents.send("exportAllComplete", "");
	});
	//フォント
	function object_array_sort(data, key, order, fn) {
		//デフォは降順(DESC)
		var num_a = -1;
		var num_b = 1;

		if (order === "asc") {
			//指定があれば昇順(ASC)
			num_a = 1;
			num_b = -1;
		}

		data = data.sort(function(a, b) {
			var x = a[key];
			var y = b[key];
			if (x > y) return num_a;
			if (x < y) return num_b;
			return 0;
		});

		//重複排除
		var arrObj = {};
		for (var i = 0; i < data.length; i++) {
			arrObj[data[i]["family"]] = data[i];
		}

		data = [];
		for (var key in arrObj) {
			data.push(arrObj[key]);
		}

		fn(data); // ソート後の配列を返す
	}
	ipc.on("fonts", (e, arg) => {
		const fm = require("font-manager");
		var fonts = fm.getAvailableFontsSync();
		object_array_sort(fonts, "family", "asc", function(fonts_sorted) {
			e.sender.webContents.send("font-list", fonts_sorted);
		});
	});
	//コピー
	ipc.on("copy", (e, arg) => {
		clipboard.writeText(arg);
	});
	//ログ
	ipc.on("log", (e, arg) => {
		var today = new Date();
		var todayStr = today.getFullYear() + "" + (today.getMonth() + 1) + "" + today.getDate();
		var log_path = join(log_dir_path, todayStr + ".log");
		fs.appendFile(log_path, "\n" + arg, function(err) {
			if (err) {
				throw err;
			}
		});
	});
	ipc.on("getLogs", (e, arg) => {
		var logs=""
		var todayLog=""
		var yestLog=""
		var yest2Log=""
		fs.readdir(log_dir_path, function(err, files) {
			if (err) throw err;
			files.filter(function(file) {
				if (file == todayStr) {
					todayLog=fs.readFileSync(join(log_dir_path, file), "utf8")
				}
				if (file == yestStr) {
					yestLog=logs+fs.readFileSync(join(log_dir_path, file), "utf8")
				}
				if (file == yest2Str) {
					yest2Log=fs.readFileSync(join(log_dir_path, file), "utf8")
				}
				logs = todayLog + yestLog + yest2Log;
			});
			logs = yest2Log + yestLog + todayLog;
			e.sender.webContents.send("logData", logs);
		});
	});
	//起動時ログディレクトリ存在確認と作成、古ログ削除
	fs.access(log_dir_path, fs.constants.R_OK | fs.constants.W_OK, error => {
		if (error) {
			if (error.code === "ENOENT") {
				fs.mkdirSync(log_dir_path);
			} else {
				return;
			}
		} else {
			fs.readdir(log_dir_path, function(err, files) {
				if (err) throw err;
				files.filter(function(file) {
					if (file != todayStr && file != yestStr && file != yest2Str) {
						fs.unlinkSync(join(log_dir_path, file));
					}
				});
			});
		}
	});
}
exports.system = system;